93.
    发明专利
    未知

    公开(公告)号:DE3141019A1

    公开(公告)日:1982-06-03

    申请号:DE3141019

    申请日:1981-10-15

    Applicant: OREAL

    Abstract: The invention provides novel nitro-paraphenylenediamine derivatives of the formula: in which R1 denotes an alkyl group, a monohydroxy- or polyhydroxy-alkyl group or an aminoalkyl group, the amino group of which is optionally monosubstituted or disubstituted by an alkyl group, and R2 denotes an alkyl group, or a cosmetically acceptable salt thereof. These derivatives are useful as direct dyes, especially for dyeing human hair.

    94.
    发明专利
    未知

    公开(公告)号:FR2492370A1

    公开(公告)日:1982-04-23

    申请号:FR8119393

    申请日:1981-10-15

    Applicant: OREAL

    Abstract: The invention provides novel nitro-paraphenylenediamine derivatives of the formula: in which R1 denotes an alkyl group, a monohydroxy- or polyhydroxy-alkyl group or an aminoalkyl group, the amino group of which is optionally monosubstituted or disubstituted by an alkyl group, and R2 denotes an alkyl group, or a cosmetically acceptable salt thereof. These derivatives are useful as direct dyes, especially for dyeing human hair.

    99.
    发明专利
    未知

    公开(公告)号:DE3025992A1

    公开(公告)日:1981-01-29

    申请号:DE3025992

    申请日:1980-07-09

    Applicant: OREAL

    Abstract: The invention relates to compositions for hair dyeing which contain, as the oxidative dye-stuff, in a cosmetically acceptable medium, para-phenylenediamine and ortho-aminophenol, or their cosmetically acceptable salts, in a ratio para-phenylenediamine/ortho-aminophenol which is such that, after the addition of an equal volume of hydrogen peroxide of 20 volumes strength and application to the hair for 30 minutes, no Bandrowsky's base can be detected in the oxidizing dyeing composition. The compositions according to the invention make it possible to impart background colorations to the hair without the formation of Bandrowsky's base.

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